Bulb



FIG. 1 is a front view of a bulb showing our new design, with the back view being a mirror image thereof;

FIG. 2 is a side view of the bulb shown in FIG. 1, with the other side view being a mirror image thereof;

FIG. 3 is a top view of the bulb shown in FIG. 1;

FIG. 4 is a bottom view of the bulb shown in FIG. 1; and,

FIG. 5 is a bottom perspective view of the bulb shown in FIG. 1.

The broken lines depicting the filament, base, and stem show unclaimed subject matter for the design. 

CLAIM The ornamental design for a bulb, as shown and described. 